<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div{
				width: 200px;
				border: 1px solid;
				margin-top: 100px;
				min-height: 0;
				transition: min-height .5s;
			}
			div:hover{
				min-height: 200px;
			}
		</style>
	</head>
	<body >
		<div></div>
	</body>
</html>
